/Engine/Source/Runtime/Core/Public/Containers/Set.h
int32 FindOrAdd ( const void * Element, const [FScriptSetLayout](API\Runtime\Core\Containers\FScriptSetLayout) & Layout, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< uint32(const void *)> GetKeyHash, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(const void *, const void *)> EqualityFn, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void(void *)> ConstructFn )